Envelop.



PATENTED JUNE 28, 1908.

W. MACDONALD.

ENVELOP.

APPLICATION FILED 1111,1110, 1907.

3 SHEETS-SHEET l.

INVENTOH DNAL-D PATENTED JUNE 23, 1908.

W. MACDONALD.

BNVELOP.

APPLICATION FILED JULY 10, 1907,

3 SHEETSSHEET 2.

INVENTOH WHLLIAM MA :1 1:1 EINALLD ATTORNEYS:

WITNESSES Nd. 891,711. PATENTED JUNE 23, 1908.

W. MACDONALD.

ENVBLUP.

AFPLIOATION FILED JULY 10,1907.

3 SHEETS-SHEET 3.

H h 1 I1 1 11 y lmwMtoz WLLIAM M UU DNALD Z813 filttozum s PATENT OFFICE.

WILLIAM MACDONALD, OF VERNA, SASKATCHEWAN, CANADA.

ENVELOP.

Specification of Letters Patent.

Patented. June 23, 1908.

Application filed July 10, 1907. Serial No. 383,027.

To all whom it may concern:

Be it known that 1, WILLIAM lVlAODONALD, a subject of the King of Great Britain, and resident of Verna, in the Province of Saskatchewan and Dominion of Canada, have invented an Improvement in Envelops, of which the following is a specification.

The object of my invention is the production of a simple and cheap envelop of the safety type, whose flaps may be securely locked together mechanically and with or without the aid of mucilage.

The details of construction, arrangement, and operation of parts are as hereinafter described and illustrated in the accompanying drawing, in which Fi ure 1 is a plan view of my improved enve op with the flaps secured together. Fig. 2 is a plan view of the envelop blank. Fig. 3 is a perspective view of the main or locking tongue of the envelop. Fig. 4 is a lan v1ew of the envelop showing the inner side flap folded. Fig. 5 is a plan view showing three of the fia s folded, the outside flap being left open. ig. 6 is an enlarged cen tral cross section of the envelop with the flaps folded and locked together. Fig. 7 is a detail view illustrating the engagement of the main or looking tongue with other parts. Fig. 8 is a perspective view of envelop, showing one side flap and the two end flaps folded. Fig. 9 is a perspective view showing envelop flaps all folded, and outer or guard tongue in position to be inserted beneath the tongue of under end flap.

The numerals 1, 2, 3, 4, indicate the several flaps of the envelop, and 5 the oblong rectangular body of the same. The side flap 1 is provided with a slot 1 and the opposite side flap 2 with a tongue 2 having a catch or lock 2 The side flap 3 has a slot 3) and the other side flap 4 has a short tongue 4". In Fi 4 the inner side flap 2 is shown folded and the main or guard tongue turned down. In Fig. 5 the end fia s 3, 4, are folded upon such side flap 2, w ereby the slot 3 of tongue 3 is brought into coincidence with the tongue 4 of end fia 4, said tongue being assed throu h the s ot. Then the outside the slot 1 1g F01 ma n 3' DLLUVVLI. 1.11.

in 1 Luna/a. :1 short tongue 4 is passed through of the same.

The final step or operation of securing the envelop consists in turning up the main or guard tongue 2 and inserting its free end through the several coincident slots and beneath the tongue 4, the free end of the tongue then projecting upward in the space from which it was cut out of the side flap 2; and its catch or look 2 then comes above the edge of the slot formed by slitting the end flap 4 to form the tongue 4. Upon any attempt to open the envelo the side catch 2 engaging the edge of the s ot of the flap 4 Will prevent withdrawal of the tongue 2 Thus the envelop is mechanically secured or locked even without the aid of any mucil'age. In practice, however, I propose to apply mucilage to the under side of the front tongue 4 as indicated by shade lines in Fig. 2, so that after the main or locking tongue 2 has been inserted in the slots as described, said tongue 4 may be scaled down on the main tongue as shown in Fig. 6, thus forming an additional means of security against withdrawal of the main tongue from the slots. The envelop is thus most securely sealed and locked, and the operation may be expeditiously accomplished.

To open the envelop, a pencil, or other device, may be inserted beneath the guard tongue 2 a between the points 6-6, indicated in Fig. 1, where the tongue is shown provided with lines of perforations. The tongue may be also easily rupturedv at this point by means of the finger nail, so that the envelop may be instantly opened.

It is obvious that the guard or locking tongue 2 may be provided with two or more catches without departing from the spirit of my invention.

What I claim is- The improved envelo having side fiaps 1 and 2 provided with a slbt 1 and tongue 2 res ectively, end flaps 3 and 4 similarly provi ed with slot 3 tongue 4, the several slots of the three flaps coinciding when the latter are folded and the tongue 4 passing outward through all, and the guard tongue 2 having catch 2 being adapted to overlie the meeting and lap ed ends of all the flaps for insertion beneat the short tongue 4, whip h is then sealed upon the guard tongue as sir-own deserivec.

WILLIAM MACDONALD.

Witnesses:

ERNST POLLRIOH, L. M. ROBINSON. 

